Happy Square Root Day

Math lovers and numerologists take note: Today, March 3, 2009, is square root day.

The unofficial holiday comes around but nine times a century, when the numbers of the calendar align so that the month and day are each equal to the square root of the year as expressed in two-digit form.
(In today's case, 3/3/09, 3 is the square root of 9—in other words, 32 = 3 x 3 = 9.)

Square root days arise in every year whose last two digits are a perfect square, or a number whose square root is a whole number: The last square root day was on February 2, 2004 (2/2/04), and the next occurrence will be on April 4, 2016 (4/4/16).


From Sara (brainy chicks are hot!)